CN110926901A - Preparation and measuring method of physical parameter index sample of fractured and overhead rock mass - Google Patents
Preparation and measuring method of physical parameter index sample of fractured and overhead rock mass Download PDFInfo
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Abstract
The invention relates to the technical field of fractured and overhead rock masses, and provides a preparation method of a physical parameter index sample of a fractured and overhead rock mass, which comprises the following steps: s1, selecting a sample preparation position on site; s2, pouring a binder at the sample preparation position to form an initial rock sample; s3, cutting the initial rock sample to form an intermediate rock sample; s4, encapsulating the side face of the middle rock sample; s5, cutting off the connection position of the intermediate rock sample and the initial rock sample to form a rock sample to be detected; and S6, dissolving and releasing the adhesive by using a curing agent to form a test sample. The liquid binder is poured on the surface of the rock body, so that the binder permeates gaps or pores in the rock body, the original shape of the rock body is shaped and assisted by structural solid shape, and the original sample of the rock body is prevented from being disturbed in the sample preparation and transportation processes; the liquid resolidifier is poured on the rock sample to dissolve and remove the binder in the rock sample, so that the rock sample is restored to the original state, and the physical parameters of the original rock sample can be measured.
Description
Technical Field
The invention relates to the technical field of fractured and overhead rock masses, in particular to a preparation and measurement method of a physical parameter index sample of a fractured and overhead rock mass.
Background
The cracked and overhead rock mass refers to various deformation damage, tension cracking and overhead rock mass of a large side slope or slope with a wide distribution domain and cracked rock mass in a structural broken zone, but does not include a broken mud layer. Most of the materials have the characteristics of large volume, no or little mud matter, scattered body and overhead, are main bodies outside the damage boundary of a large geological disaster body and original rocks, are main bodies of secondary geological disasters, and are main bodies of a structural broken zone for controlling the stability of a slope rock mass except for a mud zone. The indexes of physical properties and mechanical properties of 'fractured and overhead rock masses' are one of the difficulties and key points in the current research on mechanical parameters of rock masses, and due to the structural forms of overhead and scattered bodies, the rock masses can be disintegrated after slight disturbance, so that a better technology and a better method for obtaining in-situ or original-state large-scale samples and further measuring the physical properties (density, porosity, water content and the like) of the samples on site are not seen at present.
The 'cracked and overhead rock mass' widely distributed on various large side slopes is mostly the product of high and steep rock slope toppling deformation damage, collapse deformation damage, creep and tension fracture deformation damage and large collapse damage.
The high and steep rocky slope toppling deformation damage is a main deformation damage type of a reverse-inclined layered structure slope, is formed by long-term deformation damage of a cut reverse-inclined layered structure slope under a valley, is one of the main types of deformation damage of the layered structure valley slope, is widely distributed in southwest mountainous areas, Qinghai-Tibet plateau areas, European Alps mountains, American Luoji mountains and other areas in large-scale and extra-large-scale toppling deformation damage bodies, has the continuous extension of thousands of meters and the volume of thousands of square to hundreds of millions of square, and has great influence on geological environment, geological disaster occurrence of mountainous areas, living environment of human beings and engineering construction.
At present, boundary, cause mechanism, stability analysis and calculation and other aspects of large-scale toppled deformation bodies are deeply researched and programmed, and only in the aspects of physical and mechanical property research and parameter value taking, because the areas with serious deformation, overhead and damage are very difficult to obtain basic physical indexes, such as density, porosity, water content and the like, the areas are basically in an experience estimation state, and new technology and methods need to be innovated.
The collapse deformation damage is a main deformation damage type of the bedding high-steep rock slope, is a typical type of long-term bending deformation damage of a bedding slope (side) slope rock stratum, is large in range and large in scale, has poor stability of the damaged slope rock mass, is an important place for secondary geological disasters, and has great influence on engineering construction and human life.
At present, the boundary, the cause mechanism, the stability analysis and calculation and other aspects of the high and steep deformation damage slope are deeply researched and calculated, and for the bedding damage boundary (sliding zone), the mud material is taken as the main material, and a successful value method and result are provided for the controlled physical and mechanical property parameters, and the collapse section and the formed sheared zone rock mass are cracked and overhead, so that the in-situ sample and the measurement of the physical properties (density, porosity, water content and the like) of the collapse section and the broken and blocky damaged zone of the collapse section are not well solved, and a new technology and a new method are needed to be created.
The landslide body, the large collapse accumulation body and the like of the large landslide formed on the massive rock slope almost completely consist of damaged rock blocks and fragments, are obvious in aerial arrangement and have obvious scattered structures, deformation and damage can occur due to slight disturbance, the large-scale in-situ test sample of the scattered-aerial deformation damage body is obtained at present, and the field test of physical property parameters (density, porosity, water content and the like) is a big difficulty, so that new technology and method need to be created.
The fractured rock (excluding fault mud) forming the fault fracture zone main body is a main body for analyzing rock deformation, obtains physical property indexes (density, porosity, water content and the like) and corresponding mechanical indexes, and is an important parameter for rock stability evaluation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a physical parameter index sample of a fractured and overhead rock mass, so that the undisturbed sample of the fractured and overhead rock mass is prevented from being disturbed in the sample preparation process; provides a method for measuring physical parameter indexes of fractured and overhead rock masses, which is used for measuring the physical parameter indexes of the fractured and overhead rock masses.
The technical scheme adopted by the invention for solving the technical problems is as follows: the preparation method of the physical parameter index sample of the fractured and overhead rock mass comprises the following steps:
s1, selecting a sample preparation site on site, and removing loose substances on the surface of the rock mass at the sample preparation position;
s2, pouring liquid binder on the surface of the rock mass at the sample preparation position, wherein the binder downwards permeates into the rock mass and then is solidified and bonded to form an initial rock sample;
s3, cutting the initial rock sample to form a columnar middle rock sample only with the bottom connected with the initial rock sample into a whole;
s4, encapsulating the side face of the middle rock sample by using a heat-shrinkable piece;
s5, cutting off the connection position of the intermediate rock sample and the initial rock sample to form a rock sample to be detected, wherein the external part of the rock sample is provided with a thermal shrinkage piece, and the internal part of the rock sample is provided with the intermediate rock sample;
s6, vertically placing the rock sample to be tested, pouring a liquid-state resolidification agent on the top of the rock sample to be tested, and dissolving and removing the binder to form a test sample with a thermal shrinkage piece on the outer part and an undisturbed rock sample on the inner part.
Further, the binder is a solution prepared from natural resin and an organic solvent I; the resolidifier is an organic solvent II capable of dissolving natural resin.
Further, the natural resin is shellac resin or/and pine resin.
Further, the organic solvent I and the organic solvent II are both industrial alcohol.
Further, the purity of the industrial alcohol is greater than or equal to 95%.
Further, the heat-shrinkable part is a heat-shrinkable film or a heat-shrinkable tube.
The method for measuring physical parameter indexes of fractured and overhead rock mass comprises the following steps:
p1, preparing a test sample according to the preparation method of the physical parameter index sample of the fractured and overhead rock mass;
p2, measuring volume of test specimen as V1And measuring the volume of the heat-shrinkable member as V2(ii) a And the volume of the rock mass in the test sample is V, and the volume is calculated according to the formula (1):
V＝V1-V2(1)
p3, measuring the net dry weight of the rock mass in the test sample as m; the dry density of the rock mass in the test sample is gammadCalculating according to the formula (2):
p4, collecting disturbance samples in a natural state at the position close to the boundary of a sample preparation site, and screening to obtain rock mass granularity; testing to obtain the natural water content and the particle density of the rock mass;
p5, obtaining the natural density and porosity of the fractured and overhead rock mass by calculation according to the dry density, the natural water content and the particle density of the rock mass.
Further, in step P3, the method for measuring the net dry weight of the rock mass in the test sample comprises the following steps:
p3.1, measuring mass m of test specimen1And measuring the mass of the heat-shrinkable member as m2；
P3.2, taking part of rock mass in the test sample, and measuring the mass of the rock mass as m3Then drying the mixture and measuring the mass m of the dried mixture4(ii) a The net dry weight of the rock mass in the test specimen is then:
the invention has the beneficial effects that: the liquid binder is poured on the surface of the rock mass, so that the binder permeates into gaps or pores in the rock mass, the original shape of the rock mass is shaped, and the structural shape is assisted, so that the original-shape test sample of the cracked and overhead rock mass is prevented from being disturbed in the sample preparation and transportation processes; the liquid resolidifier is poured on the rock sample to dissolve and remove the binder in the rock sample, so that the rock sample is restored to the original state, and the physical parameters of the original rock sample can be measured. When the sample is prepared by adopting a 300mm drill bit, the sample can be directly used as a sample of a current international and domestic clastic soil large triaxial testing machine so as to fill the blank in the aspect.
Drawings
FIG. 1 is a schematic diagram of the selection of a sample location in step S1 according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the initial rock sample in step S2 according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of the intermediate rock sample in step S3 according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the structure of the encapsulated intermediate rock sample in step S4 according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of the rock sample to be tested in step S5 according to the embodiment of the present invention;
fig. 6 is a schematic structural diagram of the test specimen in step S6 according to the embodiment of the present invention.
The reference numbers in the figures are: 1-initial rock sample, 2-intermediate rock sample, 3-thermal shrinkage piece, 4-rock sample to be tested and 5-test sample.
Detailed Description
The cracked and overhead rock mass in the invention refers to a rock mass which has poor structural stability, is in an overhead shape and is easy to crush, deform and even scatter; for fractured and overhead rock masses, qualified undisturbed samples cannot be prepared by adopting the conventional sample preparation method.
The invention is further illustrated with reference to the following figures and examples.
The preparation method of the physical parameter index sample of the fractured and overhead rock mass comprises the following steps:
s1, selecting a sample preparation site on site, and removing loose substances on the surface of the rock mass at the sample preparation position;
s2, pouring liquid binder on the surface of the rock mass at the sample preparation position, wherein the binder downwards permeates into the rock mass, and then curing and binding to form an initial rock sample 1;
s3, cutting the initial rock sample 1 to form a columnar middle rock sample 2 only the bottom of which is connected with the initial rock sample 1 into a whole;
s4, encapsulating the side face of the middle rock sample 2 by using a heat-shrinkable piece 3;
s5, cutting off the connection position of the middle rock sample 2 and the initial rock sample 1 to form a rock sample 4 to be detected, wherein the outer part of the rock sample 4 is provided with a thermal shrinkage piece 3, and the inner part of the rock sample 2 is provided with the middle rock sample;
s6, vertically placing the rock sample 4 to be tested, pouring a liquid-state curing agent on the top of the rock sample 4 to be tested, and dissolving and removing the binder to form the test sample 5 with the thermal shrinkage piece 3 on the outer part and the undisturbed rock sample on the inner part.
In step S1, a sampling site is selected on site, as shown in fig. 1, the rock mass condition of the selected sampling site should be representative, and the selected sampling position should be beneficial to subsequent cutting construction; and after the sample preparation position is selected, removing loose substances on the surface of the rock-soil body until a relatively representative 'cracked and overhead rock body' is exposed.
In step S2, after step S1 is completed, liquid binder is poured onto the surface of the rock mass at the sample preparation position, the binder penetrates downward into the rock mass, and then the rock mass is shaped and assisted with structural fixing through curing and binding, so as to form an initial rock sample 1 with a stable structure, as shown in fig. 2, so that the original sample of the cracked and overhead rock mass can be prevented from being disturbed in the sample preparation and transportation processes. The shape of the initial rock sample 1 may be cylindrical, rectangular parallelepiped, etc., but is not limited to the above shape; the size of the initial rock sample 1 can meet the size of original samples of fractured and overhead rocks needing to be prepared by a large triaxial testing machine and other physical and mechanical experimental equipment.
In step S3, the initial rock sample 1 is cut with a cutting tool to form a columnar intermediate rock sample 2 having only the bottom portion integrally connected to the initial rock sample 1, as shown in fig. 3. Wherein, the cutting tool can be a diamond saw, a trepan of a drilling machine, a barrel drill and the like; the cross-section of the intermediate rock sample 2 may be square, circular, etc., but is not limited to the above-mentioned shape.
In step S4, as shown in fig. 4, the side surface of the middle rock sample 2 is wrapped by the heat shrinkable member 3, thereby protecting the middle rock sample 2.
In step S5, the connecting position between the middle rock sample 2 and the initial rock sample 1 is cut off by a cutting tool, so that the middle rock sample 2 is separated from the rock mass at the sample preparation position, and a to-be-tested rock sample 4 with a heat shrinkable member 3 on the outside and the middle rock sample 2 on the inside is formed, as shown in fig. 5. After the preparation of the rock sample 4 to be detected is completed, the rock sample 4 to be detected can be transported to a laboratory and then subjected to the next operation, and the next operation can also be directly performed on a sample preparation site.
In step S6, vertically placing the rock sample 4 to be tested, pouring a liquid resolidification agent on the top of the rock sample 4 to be tested, dissolving the resolidification agent and removing the binder in the rock sample, and then restoring the rock sample to the original shape to form the test sample 5 with the thermal shrinkage member 3 on the outside and the undisturbed rock sample on the inside, as shown in fig. 6. Through pyrocondensation piece 3 can avoid the original state rock specimen to take place breakage, warp or even scatter to follow-up volume and the quality to the rock specimen 4 that awaits measuring are measured.
According to the preparation method of the physical parameter index sample of the fractured and overhead rock mass, the liquid binder is poured on the surface of the rock mass, so that the binder permeates into gaps or pores in the rock mass, and the original shape of the rock mass is shaped and assisted by structural shape fixing, so that the original-shape sample of the fractured and overhead rock mass can be prevented from being disturbed in the sample preparation and transportation processes; the liquid resolidifier is poured on the rock sample to dissolve and remove the binder in the rock sample, so that the rock sample is restored to the original state, and the physical parameters of the original rock sample can be measured.
The binder is a solution prepared from natural resin and an organic solvent I; the resolidifier is an organic solvent II capable of dissolving natural resin. The natural resins are mainly derived from amorphous semi-solid or solid organic matter of plant exudates, which are soluble in alcohols, ethers, ketones and other organic solvents. In the embodiment of the invention, natural resin and an organic solvent I are prepared into a liquid binder according to a certain proportion; after the adhesive is poured on the surface of the rock body at the sample preparation position, the liquid adhesive downwards permeates into gaps or gaps in the rock body, after a period of time, the organic solvent I in the adhesive is volatilized, the natural rubber is solidified and adhered in the gaps or the gaps in the rock body, the rock body is shaped and assisted with structure solidification, and then the initial rock sample 1 with a stable structure is formed. After the resolidifying agent is poured on the top of the rock sample 4 to be tested, the natural resin in the rock body is dissolved in the organic solvent II to form a solution, the solution flows out from the bottom of the rock sample 4 to be tested, after a period of time, the binder in the rock body is completely removed, and then the test sample 5 with the thermal shrinkage piece 3 outside and the undisturbed rock sample inside is formed.
Preferably, the natural resin is shellac resin or/and pine resin. The organic solvent I and the organic solvent II are both industrial alcohol. Preferably, the purity of the industrial alcohol is greater than or equal to 95%. In the embodiment of the invention, three adhesives are self-prepared according to the sizes of the holes of the fractured and overhead rock masses, namely the agent A suitable for small holes in the rock mass, and the agent B and the agent C suitable for large holes in the rock mass. The agent A is prepared by dissolving lac resin in industrial alcohol and preparing into a solution with the mass percent concentration of less than 20%. The agent B is prepared by dissolving lac resin in industrial alcohol and preparing into a solution with the mass percentage concentration of 20-30%. The agent C is prepared by dissolving lac resin and pine resin together in industrial alcohol, and is prepared into a solution with the mass percent concentration of more than 30%, preferably, the mass percent concentration of the lac resin in the solution is between 10% and 20%, and the mass percent concentration of the pine resin in the solution is between 20% and 30%. Of course, solutions with other mass percentage concentrations can be prepared according to the fragmentation and overhead degree of the rock body, and are not specifically limited herein.
In step S2, before the binder is poured, the cracking and overhead degree of the rock mass should be analyzed, then one of the three binders is selected or a suitable binder is prepared on site according to the cracking and overhead degree of the rock mass, then the binder is poured on the surface of the rock mass, the binder penetrates downward into the rock mass, and then the initial rock sample 1 is formed through curing and bonding.
In the embodiment of the present invention, the heat shrinkable member 3 is a heat shrinkable film or a heat shrinkable tube. The thermal shrinkage material is also called as macromolecule memory material, which has unique memory effect, and the material after expansion and cooling shaping can be shrunk again to restore the original shape after being heated. The heat-shrinkable film or tube in the embodiment of the invention is made of a heat-shrinkable material. In step S4, a heat-shrinkable film or a heat-shrinkable tube with a suitable shrinkage rate is selected, the heat-shrinkable film or the heat-shrinkable tube is wrapped on the side surface of the middle rock sample 2, and then the heat-shrinkable film or the heat-shrinkable tube is heated, and the heat-shrinkable film or the heat-shrinkable tube shrinks on the side surface of the middle rock sample 2 to protect the middle rock sample 2, but does not generate a pressing force on the middle rock sample 2. Preferably, the heat-shrinkable member 3 is a heat-shrinkable film or tube made of a thin heat-shrinkable material, and after the side surface of the middle rock sample 2 is encapsulated by the heat-shrinkable member 3, the volume and weight of the heat-shrinkable member 3 are reduced.
The method for measuring physical parameter indexes of fractured and overhead rock mass is characterized by comprising the following steps:
p1, preparing a test sample 5 according to the preparation method of the physical parameter index sample of the fractured and overhead rock mass;
p2, measuring volume V of test specimen 51And measuring the volume of the heat-shrinkable member 3 as V2(ii) a And the volume of the rock mass in the test sample 5 is V, and the volume is calculated according to the formula (1):
V＝V1-V2(1)
p3, measuring the net dry weight of the rock mass in the test sample 5 to be m; the dry density of the rock mass in the test sample 5 is gammadCalculating according to the formula (2):
p4, collecting disturbance samples in a natural state at the position close to the boundary of a sample preparation site, and screening to obtain rock mass granularity; testing to obtain the natural water content and the particle density of the rock mass;
p5, obtaining the natural density and porosity of the fractured and overhead rock mass by calculation according to the dry density, the natural water content and the particle density of the rock mass.
In step P1, a test sample 5 is prepared according to the preparation method of the physical parameter index sample of the fractured and overhead rock mass in the embodiment of the invention, the structure of the test sample 5 is shown in fig. 6, and preferably, the test sample 5 is cylindrical.
In step P2, when measuring the volume, the laser scanner may be used to scan the coordinates of the sample and calculate the volume; or measuring the size of the sample by using a measuring tool and then calculating the volume. The volume of the test specimen 5 is measured and calculated as V1Volume of the heat-shrinkable member 3 is V2(ii) a The volume of the rock mass in the test specimen 5 is V ═ V1-V2。
The resolidifying agent in the embodiment of the invention is an organic solvent, and is preferably industrial alcohol, so that moisture and the organic solvent can be remained in the rock body in the test sample 5 prepared by the preparation method of the physical parameter index sample of the fractured and overhead rock body in the embodiment of the invention.
In step P3, the net dry weight of the rock mass in the test sample 5 is measured to be m, and the dry density of the rock mass in the test sample 5 is measured to be m
In the step P4, a disturbance sample in a natural state is collected at a position close to a boundary of a sample preparation site, the weight of the disturbance sample can be 2-5 kg according to the requirement of coarse-grained soil, the granularity composition of the rock mass is obtained through screening, the particle density of the rock mass can be further obtained, and the natural water content of the rock mass is obtained through a sampling and drying mode.
In step P5, physical parameter indexes such as natural density and porosity of the fractured and overhead rock mass can be obtained through calculation according to the dry density of the rock mass, the natural water content of the rock mass and the particle density.
In the step P3, the net dry weight of the rock mass in the test sample 5 can be obtained by integrally drying the rock mass in the test sample 5, but when the test sample 5 has a large volume and a heavy weight, the operation time is long and the labor amount is large; this mode of operation is difficult to implement, especially in situations where field operating conditions are limited.
In a preferred mode, in step P3, the method for measuring the net dry weight of the rock mass in the test specimen 5 comprises the following steps:
p3.1, measuring the weight m of the test specimen 51And measuring the mass m of the heat-shrinkable member 32；
P3.2, taking part of rock mass in the test sample 5, and measuring the mass m3Then drying the mixture and measuring the mass m of the dried mixture4(ii) a The net dry weight of the rock mass in the test specimen 5 is then:
in the embodiment of the invention, the liquid content of the rock mass in the test sample 5 is obtained by adopting a sampling and drying mode, so that the net dry weight of the rock mass in the test sample 5 is obtained, the operation time is short, the labor capacity is small, and the method is particularly suitable for the condition that the field operation condition is limited. According to the net dry weight of the rock mass in the test sample 5, the dry density of the rock mass in the test sample 5 is as follows:
Claims (8)
1. the preparation method of the physical parameter index sample of the fractured and overhead rock mass is characterized by comprising the following steps of:
s1, selecting a sample preparation site on site, and removing loose substances on the surface of the rock mass at the sample preparation position;
s2, pouring liquid binder on the surface of the rock mass at the sample preparation position, wherein the binder downwards permeates into the rock mass and then is solidified and bonded to form an initial rock sample (1);
s3, cutting the initial rock sample (1) to form a columnar middle rock sample (2) only the bottom of which is connected with the initial rock sample (1) into a whole;
s4, encapsulating the side face of the middle rock sample (2) by using a heat-shrinkable piece (3);
s5, cutting off the connecting position of the middle rock sample (2) and the initial rock sample (1) to form a rock sample (4) to be detected, wherein the outer part of the rock sample is provided with a thermal shrinkage piece (3) and the inner part of the rock sample is provided with the middle rock sample (2);
s6, vertically placing the rock sample (4) to be tested, pouring a liquid-state curing remover on the top of the rock sample (4) to be tested, and dissolving and removing the binder to form a test sample (5) with a thermal shrinkage piece (3) on the outside and an undisturbed rock sample on the inside.
2. The method for preparing the physical parameter index sample of the fractured and overhead rock mass according to claim 1, wherein the adhesive is a solution prepared from natural resin and an organic solvent I; the resolidifier is an organic solvent II capable of dissolving natural resin.
3. The method for preparing the physical parameter index sample of the fractured and overhead rock mass according to claim 2, wherein the natural resin is shellac resin or/and pine resin.
4. The method for preparing the physical parameter index sample of the fractured and overhead rock mass according to claim 2 or 3, wherein the organic solvent I and the organic solvent II are both industrial alcohol.
5. The method for preparing the physical parameter index sample of the fractured and overhead rock mass according to claim 4, wherein the purity of the industrial alcohol is greater than or equal to 95%.
6. The preparation method of the physical parameter index sample of the fractured and overhead rock mass according to the claim 1, 2 or 3, wherein the thermal shrinkage piece (3) is a thermal shrinkage film or a thermal shrinkage tube.
7. The method for measuring physical parameter indexes of fractured and overhead rock mass is characterized by comprising the following steps:
p1, preparing a test sample (5) according to the preparation method of the physical parameter index sample of the fractured and overhead rock mass as claimed in any one of claims 1 to 6;
p2, measuring volume V of test specimen (5)1And measuring the volume of the heat-shrinkable member (3) as V2(ii) a And the volume of the rock mass in the test sample (5) is V, and the volume is calculated according to the formula (1):
V＝V1-V2(1)
p3, measuring the net dry weight of the rock mass in the test sample (5) to be m; the dry density of the rock mass in the test sample (5) is gammadCalculating according to the formula (2):
p4, collecting disturbance samples in a natural state at the position close to the boundary of a sample preparation site, and screening to obtain rock mass granularity; testing to obtain the natural water content and the particle density of the rock mass;
p5, obtaining the natural density and porosity of the fractured and overhead rock mass by calculation according to the dry density, the natural water content and the particle density of the rock mass.
8. The method for measuring physical parameter indexes of fractured and overhead rock masses according to claim 7, wherein the step P3 of measuring the net dry weight of the rock mass in the test sample (5) comprises the following steps:
p3.1, measuring the mass m of the test specimen (5)1And measuring the mass m of the heat-shrinkable member (3)2；
P3.2, taking part of rock mass in the test sample (5), and measuring the mass m3Then drying the mixture and measuring the mass m of the dried mixture4(ii) a The net dry weight of the rock mass in the test specimen (5) is then:
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| CN112857868A (en) * | 2021-01-11 | 2021-05-28 | 北京市建设工程质量第一检测所有限责任公司 | Grouting redissolution sampling method for fractured rock mass |
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